Northern Tool offers the NorthStar 21-Gallon Tow-Behind Boom Broadcast and Spot Sprayer for $229.99. Coupon code "251262" cuts that to $209.99. Choose in-store pickup to dodge the $35.49 shipping fee. That's $40 off list and the lowest price we could find. It features a 2.2-GPM flow rate and two spray patterns. Deal ends April 11.